[clang] [clang][Sema] Skip the RequiresExprBodyDecls for lambda dependencies (PR #83997)

[via cfe-commits]

alexfh wrote:

It turns out debug build of clang before this patch generated an assertion on the original code as well:
```
assert.h assertion failed at llvm-project/clang/lib/AST/ExprConstant.cpp:15739 in bool clang::Expr::EvaluateAsConstantExpr(EvalResult &, const ASTContext &, ConstantExprKind) const: !isValueDependent() && "Expression evaluator can't be called on a dependent expression."
...
    @     0x5643bcdac9e4  __assert_fail
    @     0x5643b9734df7  clang::Expr::EvaluateAsConstantExpr()
    @     0x5643b89f7fea  calculateConstraintSatisfaction<>()
    @     0x5643b89f1bcf  CheckConstraintSatisfaction()
    @     0x5643b89f193e  clang::Sema::CheckConstraintSatisfaction()
    @     0x5643b90d9f23  clang::Sema::CheckConceptTemplateId()
    @     0x5643b9259656  clang::TreeTransform<>::TransformConceptSpecializationExpr()
    @     0x5643b925ce00  clang::TreeTransform<>::TransformCXXFoldExpr()
    @     0x5643b924b6e0  clang::Sema::SubstConstraintExpr()
    @     0x5643b89f9097  calculateConstraintSatisfaction()::$_0::operator()()
    @     0x5643b89f7f50  calculateConstraintSatisfaction<>()
    @     0x5643b89f1bcf  CheckConstraintSatisfaction()
    @     0x5643b89f193e  clang::Sema::CheckConstraintSatisfaction()
    @     0x5643b9237c6d  FinishTemplateArgumentDeduction<>()
    @     0x5643b9236cd2  llvm::function_ref<>::callback_fn<>()
    @     0x5643b888fa2f  clang::Sema::runWithSufficientStackSpace()
    @     0x5643b91c2e17  clang::Sema::DeduceTemplateArguments()
    @     0x5643b9248e19  clang::Sema::InstantiateClassTemplateSpecialization()
    @     0x5643b9334e73  llvm::function_ref<>::callback_fn<>()
    @     0x5643b888fa2f  clang::Sema::runWithSufficientStackSpace()
    @     0x5643b931fdc4  clang::Sema::RequireCompleteTypeImpl()
    @     0x5643b931f535  clang::Sema::RequireCompleteType()
    @     0x5643b891bad7  clang::Sema::RequireCompleteDeclContext()
    @     0x5643b90eda4d  clang::Sema::CheckTypenameType()
    @     0x5643b926edd2  clang::TreeTransform<>::TransformDependentNameType()
    @     0x5643b9243d1c  clang::TreeTransform<>::TransformType()
    @     0x5643b92436ff  clang::TreeTransform<>::TransformType()
    @     0x5643b9244293  clang::Sema::SubstType()
    @     0x5643b90d0e8a  clang::Sema::CheckTemplateIdType()
    @     0x5643b90d5015  clang::Sema::ActOnTemplateIdType()
    @     0x5643b8674084  clang::Parser::AnnotateTemplateIdTokenAsType()
    @     0x5643b86536cf  clang::Parser::ParseDeclarationSpecifiers()
    @     0x5643b864fffa  clang::Parser::ParseSpecifierQualifierList()
    @     0x5643b863da31  clang::Parser::ParseTypeName()
    @     0x5643b86262bd  clang::Parser::ParseAliasDeclarationAfterDeclarator()
    @     0x5643b8624ea0  clang::Parser::ParseUsingDeclaration()
    @     0x5643b8623e70  clang::Parser::ParseUsingDirectiveOrDeclaration()
    @     0x5643b864b6ef  clang::Parser::ParseDeclaration()
    @     0x5643b868a9a4  clang::Parser::ParseStatementOrDeclarationAfterAttributes()
    @     0x5643b8689d78  clang::Parser::ParseStatementOrDeclaration()
    @     0x5643b8693bc0  clang::Parser::ParseCompoundStatementBody()
    @     0x5643b8694bce  clang::Parser::ParseFunctionStatementBody()
    @     0x5643b85da8ad  clang::Parser::ParseFunctionDefinition()
    @     0x5643b864df89  clang::Parser::ParseDeclGroup()
    @     0x5643b85d8ec9  clang::Parser::ParseDeclOrFunctionDefInternal()
    @     0x5643b85d868e  clang::Parser::ParseDeclarationOrFunctionDefinition()
    @     0x5643b85d7434  clang::Parser::ParseExternalDeclaration()
    @     0x5643b8622693  clang::Parser::ParseInnerNamespace()
    @     0x5643b8621893  clang::Parser::ParseNamespace()
    @     0x5643b864b7de  clang::Parser::ParseDeclaration()
    @     0x5643b85d6fb6  clang::Parser::ParseExternalDeclaration()
    @     0x5643b85d516b  clang::Parser::ParseTopLevelDecl()
    @     0x5643b85ceebe  clang::ParseAST()
    @     0x5643b831a4c3  clang::FrontendAction::Execute()
    @     0x5643b8294efd  clang::CompilerInstance::ExecuteAction()
    @     0x5643b717f84e  clang::ExecuteCompilerInvocation()
    @     0x5643b71737c6  cc1_main()
    @     0x5643b7171066  ExecuteCC1Tool()
    @     0x5643b843fe3e  llvm::function_ref<>::callback_fn<>()
    @     0x5643bcc44415  llvm::CrashRecoveryContext::RunSafely()
    @     0x5643b843f5bb  clang::driver::CC1Command::Execute()
    @     0x5643b8400494  clang::driver::Compilation::ExecuteCommand()
    @     0x5643b84007af  clang::driver::Compilation::ExecuteJobs()
    @     0x5643b841ea80  clang::driver::Driver::ExecuteCompilation()
    @     0x5643b717061b  clang_main()
    @     0x5643b716d834  main
```

I'll try to figure out what's wrong with the original code.

https://github.com/llvm/llvm-project/pull/83997